Plant Growth-Promoting Bacteria for Improving Crops Under Saline Conditions

  • Leila Bensidhoum
  • El-hafid Nabti
Part of the Soil Biology book series (SOILBIOL, volume 56)


Elevated concentration of salinity hinders plant life from germination to final step. So, numerous mechanisms are inhibited, such as phytohormone synthesis, nutrient uptake, root and shoot regulation, photosynthesis, and DNA replication. It is well documented that the plant growth-promoting bacteria/rhizobacteria (PGPB/R) colonize plants and stimulate plant growth by different processes. In this way, halotolerant or halophilic PGPB become important; therefore, their capability resides in the rise of resistance toward high salt levels by eminent osmoregulatory mechanism to preserve regular cell functions. This kind of bacteria provides plants with many activities to challenge osmotic stress such as phytohormone synthesis [auxins, gibberellic acid (GA), cytokinins (CK), abscisic acid (ABA)], phosphate solubilization, and siderophore production. Adding to that, ACC deaminase is an important enzyme implicated in ethylene reduction. Moreover, PGPB are also capable of colonizing plants endophytically and synthetizing different antimicrobial metabolites like antifungal and antibacterial substances and plant systemic resistance. PGPB are similar in restoration and bioremediation of soils.


Bacteria–rhizobacteria Plant growth promotion Osmoregulation Salinity 


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Leila Bensidhoum
    • 1
  • El-hafid Nabti
    • 1
  1. 1.Faculté des Sciences de la Nature et de la Vie, Laboratoire de Maitrise des Energies RenouvelablesUniversité de BejaiaBejaiaAlgeria

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